feat: redesign Exams List page to show submitted custom exams

- Added Custom Exams tab showing all exams from Generation page
- Displays title, module badges, duration, and status
- Added Create Exam button
- Kept Exam Sessions tab for institutional sessions
- Search filters across exams

Made-with: Cursor

node_modules/embla-carousel/components/Limit.d.ts

@@ -0,0 +1,11 @@
+export type LimitType = {
+    min: number;
+    max: number;
+    length: number;
+    constrain: (n: number) => number;
+    reachedAny: (n: number) => boolean;
+    reachedMax: (n: number) => boolean;
+    reachedMin: (n: number) => boolean;
+    removeOffset: (n: number) => number;
+};
+export declare function Limit(min?: number, max?: number): LimitType;